Pressure-regulating device for compensators of direct-acting pumps.



No. 721,075. PATBNTED FER 17, 1903.

. P. F. ODDIE.

PRESSURE REGULATING DEVICE FOR GOMPENSATORS OF DIRECT ACTING PUMPS.

urmcumn FILED FEB. 11. 1902.

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PATENTBD FEB.. 17,' 1903.

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UNITED STATES PATENT OFFICE.

PHILIP FRANCIS ODDIE, OF OSCHERSLEBEN, NEAR MAGDEBURG, GERMANY.

PRESSURE-REGULATING DEVICE FOR COMP ENSATORS OF DIRECT-ACTING PUMPS.

SPECIFICATION forming part of Letters Patent No. 721,075, dated February 17, 1903.

7 Application filed February 11, 1902. Serial No. 93,597. (No model.)

To alt whom, it may concern:

Be it known that I, PHILIP FRANCIS ODDIE, civil engineer, a subject of the King of Great Britain and Ireland, residing at Oschersleben, near Magdeburg, Germany, have invented new and useful Improvements in or Relating to Pressure-Regulating Devices for Compensators of Direct-Acting Pumps, of which the following is a specification.

My inventionrelates to pressure-regulatin g devices for compensators of direct.- acting pumps, and has for its chief object to provide a regulation of the pressure of the working fluid in the compensator-cylinders of directacting pumps. In such pumps as hitherto constructed when the compensator-pressure is too great the pump makes too long a stroke, and, on the other hand, should the pressure be too small the pump makes too short a stroke. The proper pressure required in the compensator cylinder or cylinders of such pumps varies with the steam-pressure, the water-pressure, and also with the speed, so that an ordinary spring or constantly-loaded safety-valve will not meet the requirements of these varying conditions.

According to my invention a valve is provided the action of which depends on the length of stroke of the pump-that is to say, the valve only acts after the pump-pistons have exceeded the normal length of stroke and remains inactive should the pistons make too short a stroke. One form of carrying out this is shown in the accompanying drawings, in which the valve-casing is connected with the air-pressure reservoir of the compensator, and in which Figure 1 is a side elevation, partly in section; and Fig. 2 a detail view of the non-return valve shown in Fig. 1.

s is the steam-cylinder, the piston of which is connected by a rod r with the cross-head 25. To the other end of the latter the piston-rod d of the pump-cylinder (not shown) is attached.

e designatesthe compensating or equalizing,

by a lateral rod and rests freely upon the equalizing-pistonf without being connected thereto. The two levers g and h are pivoted together by means of a bolt 7;, upon which is rotatably mounted a roller Z, which can slide in a slot m in the cross-head t.

The space beneath the equalizing-plunger fis connected through a conduit n with an air-chamber o. The air is maintained under constant pressure by means of a small airpump p, driven, say, by the lateral guide-rod it, previously mentioned. The power acting in the first half of the stroke upon the equalizing-plunger is given back to the engine during the second half of the stroke when the pressure acting upon the steam-piston is reduced in consequence of the expansion of the working fluid. I

In connection with the air-chamber 0 is a non-return valve 2, mounted in a casing 1 and opening inward. It is provided with a spindle 3 and cap 4. A spring 5 presses on this cap 4 and tends to keep the valve closed.

In the constructional form shown a lever a is provided, rotatably mounted at b on the casing, one end of which is so arranged and attached by means of alink c to some reciprocating part of the pump, preferablyto the guide-rod k, that it reproduces on a suitablyreduced scale the motion of the pump-piston. The other end of the lever is provided with a set-screw 6, which can be adjusted so that when the pump is making its proper or normal stroke its point just touches the cap 4. If, however, for any reason the pump should make a slightly-longer stroke, thepoint of the set-screw will presson the cap 4 and the valve 2 will be opened and the pressure relieved. This action will be'repeatedalso at the end of the following stroke should the pressure continue to be too great until the stroke has again become normal.

As mentioned, a small air pump or compressor p is used, so as to make up for the loss of air. This air-pump, which is provided with the inlet Valve 19, works constantly with the main pump and forces air into the chamber 0 through the communicating valve 19 The pressure of the air therefore, con-.

stantly iIlCI6a,S6S"l1IItll the full stroke' is reached, while further increase is prevented by the action of the valve, as before described.

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The invention is not limited to the type of pump above described, as it may be applied to pumps of the oscillating-cylinder type or to other types for compensator-pumps.

While I have shown my invention as embodied in but oneform, it will be understood that I do not so limit myself, as many modifications and changes might suggest themselves to those skilled in the art, which modifications could be made without departing from the spirit of my said invention.

Having thus described my said invention, what I claim, and desire to secure by Letters Patent of the United States, is-

1.. In a pressure-regulating mechanism for direct-acting pumps, the combination with the steam and pump cylinders, pistons and piston-rod connecting the same; of a compensator-cylinder disposed at right angles to said cylinders, a piston therein, connecting means interposed between said piston-rod and compensator-piston, means for exerting a pressure behind said compensator-piston, and means operated by said compensator-piston for relieving said pressure when the stroke of said piston-rod exceeds certain limits.

2. In a pressure-regulating mechanism for direct-acting pumps, the combination with the steam and pump cylinders, pistons and piston-rod connecting the same; of a compensator-cylinder disposed at right angles to said cylinders, a piston therein, connecting means interposed between said piston -rod and compensator-piston, a pump operated by said piston-rod for exerting a pressure behind said compensator-piston, and means for relieving said pressure when the stroke of said piston-rod exceeds certain limits.

3. In a pressure-regulating mechanism to compensators of direct-acting pumps, the combination with the steam and pump cylinders, pistons and a piston-rod connecting the same; of acompensator-cylinderdisposed at right angles to said cylinders, a piston in said compensator-cylinder, an air-chamber having communication with said compensatorcylinder, connecting means interposed between said piston-rod and compensatorpiston, means for normally maintaining a pressure in said air-chamber, and means operated by said compensator-piston for automatically relieving the pressure in said airchamber when the stroke of said piston-rod exceeds certain limits.

4. In compensating mechanism for directacting pumps, the combination with the steam and pump cylinders, pistons and a piston-rod connecting same; of a compensator-cylinder located at right angles to said cylinders, a piston therein, a toggle-lever having one end held stationary and its central jointed portion adapted to be acted upon by said piston-rod, a link having one end stationary'and its free end connected to the lower end of said toggle-lever resting upon said compensator-piston, an air-chamber having communication with said compensator-cylinder, means for normally maintaining a pressure in said airchamber, and means for relieving the pressure in said air-chamber when the stroke of said piston exceeds predetermined limits.

'5. In compensating mechanism for directacting pumps, the combination with the steam and pump cylinders, pistons and a piston-rod connecting same; of a compensator-cylinder located at right angles to said cylinders, a piston therein, a toggle-lever having one end held stationary and its central jointed portion adapted to be acted upon by said pistonrod, a link having one end stationary and its free end connected to the lower end of said toggle-lever resting upon said compensatorpiston, an air-chamber having communication with said compensator-cylinder, apump operated by said link for normally maintainin g a pressure in said air-chamber, and means for relieving the pressure in said air-chamber when the stroke of said piston exceeds predetermined limits.

6. In compensating mechanism for directacting pumps, the combination with the steam and pump cylinders, pistons and a piston-rod connecting same; of a compensator-cylinder located at right angles to said cylinders, a piston therein, a toggle-lever having one end held stationary and its central jointed portion adapted to be acted upon by said piston-rod, a link having one end stationary and its free end connected to the lower end of said togglelever resting upon said compensator-piston, an air-chamber having communication with said compensatorcylinder, means for normally maintaining a pressure in said airchamber, and a relief-valve operated by said link for relieving the pressure in said airchamber when the stroke of said piston exceeds predetermined limits.

7. In compensating mechanism for directacting pumps, the combination with the steam and pump cylinders, pistons and apiston-rod connecting same; of a compensator-cylinder located at right angles to said cylinders, a piston therein, a toggle-lever having one end held stationary and its centraljointed portion adapted to be acted upon by said piston-rod, a link having one end stationary and its free end connected to the lower end of said togglelever resting upon'said compensating piston, an air-chamber having communication with said compensator-cylinder, a pump operated by said link for normally maintaining a pressure in said air-chamber, and a relief-valve operated by said link for relieving the pressure in said air-chamber when the stroke of said piston exceeds predetermined limits.

8. In compensating mechanism for directacting pumps, the combination with the steam and pump cylinders, pistons and piston-rod connecting the same; of a compensating cylinder disposed at right angles to said cylinders, a piston therein connecting means interposed between said piston-rod and compensating piston, an air-chamber having communication with said compensating cylinder; a pivoted link having its free end coni said valve will be automatically opened when nected to said connecting means, a pump opthe stroke of said piston-rod exceeds a cererated by said link for normally maintaining tain limit. a pressure in said air-chamber, arelief-valve In testimony whereof I have signed my 5 connected to said air-chamber, means carname to this specification in the presence of 15 ried by said Valve for normally retaining the two subscribing Witnesses.

same closed, a pivoted lever carrying an ad- PHILIP FRANCIS ODDIE. justable set-screw adapted to bear upon said Witnesses: Valve, and a connection interposed between L. PALMER,

1o said-pivoted lever and said link, whereby HERMANN HOBBE. 

